Coil for electromagnets.



Patanted Dec. 25, I900.

i ,5 i i .M. 4 J 4 1 I. i 1 g 0 M (Applicltion filed Nov. 29, 1899.)

(No Model.)

WITNESSES.- @116. fiw

UNITED STATES PATENT OFFICE.

SEVERN D. SPRONG, OF LONG BRANCH, NEIV JERSEY, ASSIGNOR OF TWO- THIRDS TO CHARLES GETTER AND WILLIAM P. ADAMS, OF SAME PLACE.

COIL FOR ELECTROMAGNETS.

SIECIFIGATION forming part of Letters Patent No. 664,442, dated December 25, 1900.

Application filed November 29,1899. Serial No. 738,637- (No model.)

To all whont it may concern:

Be it known that I, SEVERN D. SPRONG, a citizen of the United States, and aresident of Long Branch, county'of Monmouth, and State of New Jersey, have invented certain new and useful Improvements in Coils for Electromagnets, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof, in which similar letters of reference indicate corresponding parts.

This invention relates to improvements in coils for electromagnets; and the object thereof is to providea structure of this character which embodies a fine-wire coil, a coarse-wire coil, and insulation, the parts being so constructed and assembled that any of them can be readily removed from the metallic core comprising one arm of the magnet without the necessity of disarranging or destroying the remaining parts, whereby when a flaw is discovered in the insulation or in either of the wire coils the defective part can be readily removed from the metallic core and renewed without the necessity of unwinding the coils or renewing the core, as is necessary when repairing the ordinary wound magnet commonly employed.

The invention is especially applicable for 0 that class of magnets used in the construction of arc-lamps, and by its use the necessity of maintaining a reserve supply of fullywound magnets is obviated and the time and labor required for repairing is reduced to a minimum, thus materially reducing the cost of maintaining magnets in an operative condition.

The invention will be hereinafter fully described, and specifically set forth in the anneXed claim.

In the accompanying drawings, forming part of this specification, Figure 1 is aside elevation of my improved coil, showing the same in position upon a metallic core com- 5 prising one arm of an electromagnet. Fig. 2

is a plan view thereof, and Fig. 3 is a perspective view illustrating the several parts comprising the coil dissasembled.

In the practice of my invention I employ, primarily,a fine-wire coil A and a coarse-wire coil B, the wire comprising these said coils being coated in the customary manner. Each coil is wound separately upon asuitable form,and they are of equal diameter, but of any adapted variable height, and they are held intact by means of cords aand b, whereby they may be readily handled without liability of becomingdisarranged or u ncoiled. These coils are insulated from each other by means of a centrally-located cylinderO, of adapted insu- 6o lating material, and a ring D, of similar material, and rings E, of insulating material, are placed around each end of the cylinder 0 to form a complete spool, which is so constructed that its several parts are capable of being individually removed and renewed when a flaw is discovered in any of them. The'rings E are each supplied with a radiallyextended aperture 6, through which the inner end of the coil B is adapted to pass, and for the pur- 7o pose of making room for the downwardlyextended portion of the said end anotch e is cut in the inner periphery of the said ring. These rings are of equal proportion, whereby they are interchangeable and can be placed at either the top or bottom of the spool. The ring D is also supplied with an aperture d and a notch or recess d for engaging the inher end of the coil A, as clearly illustrated in the drawings. All of the parts comprising the said coil or spool are adapted to be assembled snugly together, as illustrated by Fig. 1 of the drawings; but they are not permanently fastened to each other, and they can be readily dissasembled, asillustrated by Fig. 3 of the drawings, for the purpose of renewing any of the parts.

In use the spool is simply slipped over the iron core F, comprising one arm of the magnet, and it is obvious that when a flaw is discovered in either coil or in any part of the insulation it is simply necessary to remove and renew the defective part or parts without the necessity of disturbing or renewing the core, which is not permanently attached to the spool, as is the case in the ordinary magnet, where the coil is wound directly upon the iron core.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

An electromagnetic coil, comprising acen- 2 eoaaez In testimony that I claim the foregoing as [O my invention I have signed my name, in presence of two witnesses, this 20th day of November, l899.

SEVERN D. SPRONG.

Witnesses:

O. HENRY DRUIN, CHARLES W. BENNETT. 

